FOOD IN OTHER PLACES:
In some countries, it is the custom to finish everything on your plate. In others, you´re expected to leave a bit, indicating that the host was so generous you couldn´t finish.
A guest who samples some of everything always pleases the host. However, if something doesn´t look palatable, better not ask what it is. The reply is likely to make the situation worse"?¦maybe much worse.
In some less-developed countries do not eat with your left hand. If you forget, other diners will consider you unclean and perhaps uncivilized. Why? Left hands are often used when no loo paper is available.